Reft of my spouse, forlorn I dwell Here in my forest citadel. Or wild with terror and distress Roam through the distant wilderness. Vext by my brother Báli long My soul has borne the scathe and wrong.

In plain words: Sugriva explains that he has lost his wife and lives alone in the forest, sometimes fleeing in terror. His brother Bali has wronged and troubled him for a long time.